16581250979 has 2 divisors, whose sum is σ = 16581250980. Its totient is φ = 16581250978.

The previous prime is 16581250969. The next prime is 16581250991. The reversal of 16581250979 is 97905218561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16581250979 - 2⁴ = 16581250963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16581250979.

It is not a weakly prime, because it can be changed into another prime (16581250949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8290625489 + 8290625490.

It is an arithmetic number, because the mean of its divisors is an integer number (8290625490).

Almost surely, 2^16581250979 is an apocalyptic number.

16581250979 is a deficient number, since it is larger than the sum of its proper divisors (1).

16581250979 is an equidigital number, since it uses as much as digits as its factorization.

16581250979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 53.

The spelling of 16581250979 in words is "sixteen billion, five hundred eighty-one million, two hundred fifty thousand, nine hundred seventy-nine".